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I think Ash-Greninja will be present in Pokémon Sun and Moon, and that the "Red Water Shuriken" is its exclusive Z-Move. That black aura that you see in the gif might be the Z-Power.
Furthermore, I believe that Core Enforcer is another exclusive Z-Move. Think about it: Zygarde get this move only in the Complete Form, but the transformation takes place during the battle. And I don't think that the game remove temporarily a move to insert Core Enforcer.
